Since I have been having problems with my cold start valve, I took it off again. This gave me an opportunity to see if anymore oil has collected in the intake manifold from the breather since I last cleaned it out in December 2008.
Well, more has collected. This time it is no longer grungy but is clean oil which means it collected between December and now. Just to check, I took off the brake booster and an accessory vacuum line from the back of the intake manifold. Both had a fair amount of oil residue inside the hoses as well. This seems to be more oil from the blow by gasses than I would expect.
What would be the cause of excessive oil in the crankcase gasses going to the venturi and intake manifold? Would driving habits have any effect? In an attempt to adjust the fuel mixtures and throttle linkage, my engine has done a lot more of idling than normal driving lately. In general I know this isn't good for our engines, but I wonder if it would increase oil in the crankcase gasses?
Any thoughts?